date:Nov 27, 2018
eak of E. coli O157 illnesses associated with romaine lettuce in Canada and the United States.
The illnesses that were detected as part of this E. coli O157 outbreak occurred over a period of a few weeks from mid-October to early November. The challenge for food safety investigators is identifying the specific origin of the product, farm and date of harvest for romaine lettuce that was in the eastern Canadian market at that time.
In the current case, epidemiological evidence has pointed to rom